Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (9): 2280-2286.doi: 10.3866/PKU.WHXB201605124

• ARTICLE • Previous Articles     Next Articles

Magnesiothermic Reduction Preparation and Electrochemical Properties of a Highly Ordered Mesoporous Si/C Anode Material for Lithium-Ion Batteries

Yan-Ping TANG1,Sha YUAN1,Yu-Zhong GUO1,*(),Rui-An HUANG2,*(),Jian-Hua WANG1,Bin YANG2,Yong-Nian DAI2   

  1. 1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China
    2 National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, P. R. China
  • Received:2016-03-14 Published:2016-09-08
  • Contact: Yu-Zhong GUO,Rui-An HUANG E-mail:ynguocn62@sina.com;rahuang2002@163.com
  • Supported by:
    National Natural Science Foundation of China(51464025)

Abstract:

A highly ordered mesoporous Si/C composite was prepared by magnesiothermic reduction method, using SBA-15 as the precursor at 660 ℃ with subsequent carbon coating. This Si/C composite preserved the ordered honeycomb pore channels of SBA-15 and exhibited a lotus root-like structure with high packing density. A liquid ambient reaction model is proposed to explain the reaction between SBA-15 and magnesium powder at 660 ℃ as well as the mechanism by which the highly ordered mesoporous structure is generated. The phase composition and morphology of this material were analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption and Raman spectroscopy. The excellent electrochemical performance of the as-prepared material suggests potential applications as an anode material in second-generation Li-ion batteries.

Key words: Li-ion battery, Mesoporous silicon, Anode material, Nanocomposite, Magnesiothermic reduction method

MSC2000: 

  • O646